Building 3D model

Towards residential nZEB with off-site prefabricated hybrid façade systems using a variety of materials





nZEB renovation, prefabricated wall, all-in-one façade kit, integrated HVAC component, TRNSYS simulation


Following the need of urban areas to maintain the existing building stock and simultaneously upgrade the overall energy performance, the renovation down-to-nZEB state has already become a necessity. In this regard, a vast range of prefabricated solutions have been developed lately. The main objective of such solutions would be not only to constitute an effective system to tackle building energy consumption but also to be versatile in terms of implementation and economic viability. In this regard, an adaptable off-site prefabricated envelope solution with an embodied HVAC system called “SmartWall” has been developed. The SmartWall can minimise thermal losses through the well-insulated envelope while, at the same time, its integrated HVAC system efficiently maintains indoor thermal comfort conditions. This study examines the virtual implementation of the SmartWall as a “Plug-n-Play” renovation solution to reach the nZEB state of a typical apartment in a multi-family residence in Athens. The analysis considers two SmartWall alternatives using conventional and eco-friendly materials. The results indicate a reduction of 88% in primary energy consumption without affecting thermal comfort conditions and highlighting that the nZEB state can be ensured if the SmartWall application is enhanced with photovoltaic modules.

How to Cite

Katsigiannis, E., Gerogiannis, P., Atsonios, I., Manolitsis, A., & Founti, M. (2023). SmartWall: Towards residential nZEB with off-site prefabricated hybrid façade systems using a variety of materials. Journal of Facade Design and Engineering, 11(2), 029–050.




Arakawa Martins, L., Soebarto, V., & Williamson, T. (2022, January 1). A systematic review of personal thermal comfort models. Building and Environment. Elsevier Ltd. DOI:

Attia, S., Eleftheriou, P., Xeni, F., Morlot, R., Ménézo, C., Kostopoulos, V., … Hidalgo-Betanzos, J. M. (2017). Overview and future challenges of nearly zero energy buildings (nZEB) design in Southern Europe. Energy and Buildings, 155, 439–458. DOI:

D’Oca, S., Ferrante, A., Ferrer, C., Pernetti, R., Gralka, A., Sebastian, R., & Veld, P. op t. (2018). Technical, financial, and social barriers and challenges in deep building renovation: Integration of lessons learned from the H2020 cluster projects. Buildings, 8(12). DOI:

Evola, G., Costanzo, V., Urso, A., Tardo, C., & Margani, G. (2022). Energy performance of a prefabricated timber-based retrofit solution applied to a pilot building in Southern Europe. Building and Environment, 222. DOI:

Fiorentini, M., Cooper, P., & Ma, Z. (2015). Development and optimization of an innovative HVAC system with integrated PVT and PCM thermal storage for a net-zero energy retrofitted house. Energy and Buildings, 94, 21–32. DOI:

Gilani, S. I. U. H., Khan, M. H., & Pao, W. (2015). Thermal Comfort Analysis of PMV Model Prediction in Air Conditioned and Naturally Ventilated Buildings. In Energy Procedia (Vol. 75, pp. 1373–1379). Elsevier Ltd. DOI:

Katsigiannis, E., Gerogiannis, P. A., Atsonios, I., Bonou, A., Mandilaras, I., Georgi, A., … Founti, M. (2022). Energy assessment of a residential building renovated with a novel prefabricated envelope integrating HVAC components. In IOP Conference Series: Earth and Environmental Science (Vol. 1078). Institute of Physics. DOI:

Mitra, D., Steinmetz, N., Chu, Y., & Cetin, K. S. (2020). Typical occupancy profiles and behaviors in residential buildings in the United States. Energy and Buildings, 210. DOI:

Ochs, F., Siegele, D., Dermentzis, G., & Feist, W. (2015). Modelling, testing and optimization of a MVHR combined with a small-scale speed controlled exhaust air heat pump. Building Simulation Applications, 2015-Febru, 83–91.

Piaia, E., Turillazzi, B., Longo, D., Boeri, A., & Giulio, R. Di. (2019, November 29). Plug-and-Play and innovative process technologies (Mapping/ Modelling/Making/ Monitoring) in deep renovation interventions. TECHNE. Firenze University Press.

Rovers, R., Zikmund, A., Lupišek, A., Borodinecs, A., Novák, E., Matoušková, E., … Ott, W. (2018). A Guide Into Renovation Package Concepts for Mass Retrofit of Different Types of Buildings With Prefabricated Elements for (n)ZEB Performance. Retrieved from

Sandberg, K., Orskaug, T., & Andersson, A. (2016). Prefabricated Wood Elements for Sustainable Renovation of Residential Building Façades. In Energy Procedia (Vol. 96, pp. 756–767). Elsevier Ltd. DOI: